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GLGET(3G)				  OpenGL Manual 				GLGET(3G)

NAME
       glGet - return the value or values of a selected parameter

C SPECIFICATION
       void glGetBooleanv(GLenum pname, GLboolean * params);

C SPECIFICATION
       void glGetDoublev(GLenum pname, GLdouble * params);

C SPECIFICATION
       void glGetFloatv(GLenum pname, GLfloat * params);

C SPECIFICATION
       void glGetIntegerv(GLenum pname, GLint * params);

C SPECIFICATION
       void glGetInteger64v(GLenum pname, GLint64 * params);

PARAMETERS
       pname
	   Specifies the parameter value to be returned. The symbolic constants in the list below
	   are accepted.

       params
	   Returns the value or values of the specified parameter.

C SPECIFICATION
       void glGetBooleani_v(GLenum pname, GLuint index, GLboolean * data);

C SPECIFICATION
       void glGetIntegeri_v(GLenum pname, GLuint index, GLint * data);

C SPECIFICATION
       void glGetFloati_v(GLenum pname, GLuint index, GLfloat * data);

C SPECIFICATION
       void glGetDoublei_v(GLenum pname, GLuint index, GLdouble * data);

C SPECIFICATION
       void glGetInteger64i_v(GLenum pname, GLuint index, GLint64 * data);

PARAMETERS
       pname
	   Specifies the parameter value to be returned. The symbolic constants in the list below
	   are accepted.

       index
	   Specifies the index of the particular element being queried.

       data
	   Returns the value or values of the specified parameter.

DESCRIPTION
       These four commands return values for simple state variables in GL.  pname is a symbolic
       constant indicating the state variable to be returned, and params is a pointer to an array
       of the indicated type in which to place the returned data.

       Type conversion is performed if params has a different type than the state variable value
       being requested. If glGetBooleanv is called, a floating-point (or integer) value is
       converted to GL_FALSE if and only if it is 0.0 (or 0). Otherwise, it is converted to
       GL_TRUE. If glGetIntegerv is called, boolean values are returned as GL_TRUE or GL_FALSE,
       and most floating-point values are rounded to the nearest integer value. Floating-point
       colors and normals, however, are returned with a linear mapping that maps 1.0 to the most
       positive representable integer value and -1.0 to the most negative representable integer
       value. If glGetFloatv or glGetDoublev is called, boolean values are returned as GL_TRUE or
       GL_FALSE, and integer values are converted to floating-point values.

       The following symbolic constants are accepted by pname:

       GL_ACTIVE_TEXTURE

	   params returns a single value indicating the active multitexture unit. The initial
	   value is GL_TEXTURE0. See glActiveTexture().

       GL_ALIASED_LINE_WIDTH_RANGE

	   params returns a pair of values indicating the range of widths supported for aliased
	   lines. See glLineWidth().

       GL_ARRAY_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   target GL_ARRAY_BUFFER. If no buffer object is bound to this target, 0 is returned.
	   The initial value is 0. See glBindBuffer().

       GL_BLEND

	   params returns a single boolean value indicating whether blending is enabled. The
	   initial value is GL_FALSE. See glBlendFunc().

       GL_BLEND_COLOR

	   params returns four values, the red, green, blue, and alpha values which are the
	   components of the blend color. See glBlendColor().

       GL_BLEND_DST_ALPHA

	   params returns one value, the symbolic constant identifying the alpha destination
	   blend function. The initial value is GL_ZERO. See glBlendFunc() and
	   glBlendFuncSeparate().

       GL_BLEND_DST_RGB

	   params returns one value, the symbolic constant identifying the RGB destination blend
	   function. The initial value is GL_ZERO. See glBlendFunc() and glBlendFuncSeparate().

       GL_BLEND_EQUATION_RGB

	   params returns one value, a symbolic constant indicating whether the RGB blend
	   equation is GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN or GL_MAX.
	   See glBlendEquationSeparate().

       GL_BLEND_EQUATION_ALPHA

	   params returns one value, a symbolic constant indicating whether the Alpha blend
	   equation is GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN or GL_MAX.
	   See glBlendEquationSeparate().

       GL_BLEND_SRC_ALPHA

	   params returns one value, the symbolic constant identifying the alpha source blend
	   function. The initial value is GL_ONE. See glBlendFunc() and glBlendFuncSeparate().

       GL_BLEND_SRC_RGB

	   params returns one value, the symbolic constant identifying the RGB source blend
	   function. The initial value is GL_ONE. See glBlendFunc() and glBlendFuncSeparate().

       GL_COLOR_CLEAR_VALUE

	   params returns four values: the red, green, blue, and alpha values used to clear the
	   color buffers. Integer values, if requested, are linearly mapped from the internal
	   floating-point representation such that 1.0 returns the most positive representable
	   integer value, and -1.0 returns the most negative representable integer value. The
	   initial value is (0, 0, 0, 0). See glClearColor().

       GL_COLOR_LOGIC_OP

	   params returns a single boolean value indicating whether a fragment's RGBA color
	   values are merged into the framebuffer using a logical operation. The initial value is
	   GL_FALSE. See glLogicOp().

       GL_COLOR_WRITEMASK

	   params returns four boolean values: the red, green, blue, and alpha write enables for
	   the color buffers. The initial value is (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE). See
	   glColorMask().

       GL_COMPRESSED_TEXTURE_FORMATS

	   params returns a list of symbolic constants of length
	   GL_NUM_COMPRESSED_TEXTURE_FORMATS indicating which compressed texture formats are
	   available. See glCompressedTexImage2D().

       GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum number of active shader storage blocks that may
	   be accessed by a compute shader.

       GL_MAX_COMBINED_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum total number of active shader storage blocks
	   that may be accessed by all active shaders.

       GL_MAX_COMPUTE_UNIFORM_BLOCKS

	   params returns one value, the maximum number of uniform blocks per compute shader. The
	   value must be at least 14. See glUniformBlockBinding().

       GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS

	   params returns one value, the maximum supported texture image units that can be used
	   to access texture maps from the compute shader. The value may be at least 16. See
	   glActiveTexture().

       GL_MAX_COMPUTE_UNIFORM_COMPONENTS

	   params returns one value, the maximum number of individual floating-point, integer, or
	   boolean values that can be held in uniform variable storage for a compute shader. The
	   value must be at least 1024. See glUniform().

       GL_MAX_COMPUTE_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to
	   compute shaders.

       GL_MAX_COMPUTE_ATOMIC_COUNTER_BUFFERS

	   params returns a single value, the maximum number of atomic counter buffers that may
	   be accessed by a compute shader.

       GL_MAX_COMBINED_COMPUTE_UNIFORM_COMPONENTS

	   params returns one value, the number of words for compute shader uniform variables in
	   all uniform blocks (including default). The value must be at least 1. See glUniform().

       GL_MAX_COMPUTE_WORK_GROUP_INVOCATIONS

	   params returns one value, the number of invocations in a single local work group
	   (i.e., the product of the three dimensions) that may be dispatched to a compute
	   shader.

       GL_MAX_COMPUTE_WORK_GROUP_COUNT

	   Accepted by the indexed versions of glGet.  params the maximum number of work groups
	   that may be dispatched to a compute shader. Indices 0, 1, and 2 correspond to the X, Y
	   and Z dimensions, respectively.

       GL_MAX_COMPUTE_WORK_GROUP_SIZE

	   Accepted by the indexed versions of glGet.  params the maximum size of a work groups
	   that may be used during compilation of a compute shader. Indices 0, 1, and 2
	   correspond to the X, Y and Z dimensions, respectively.

       GL_DISPATCH_INDIRECT_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   target GL_DISPATCH_INDIRECT_BUFFER. If no buffer object is bound to this target, 0 is
	   returned. The initial value is 0. See glBindBuffer().

       GL_MAX_DEBUG_GROUP_STACK_DEPTH

	   params returns a single value, the maximum depth of the debug message group stack.

       GL_DEBUG_GROUP_STACK_DEPTH

	   params returns a single value, the current depth of the debug message group stack.

       GL_CONTEXT_FLAGS

	   params returns one value, the flags with which the context was created (such as
	   debugging functionality).

       GL_CULL_FACE

	   params returns a single boolean value indicating whether polygon culling is enabled.
	   The initial value is GL_FALSE. See glCullFace().

       GL_CURRENT_PROGRAM

	   params returns one value, the name of the program object that is currently active, or
	   0 if no program object is active. See glUseProgram().

       GL_DEPTH_CLEAR_VALUE

	   params returns one value, the value that is used to clear the depth buffer. Integer
	   values, if requested, are linearly mapped from the internal floating-point
	   representation such that 1.0 returns the most positive representable integer value,
	   and -1.0 returns the most negative representable integer value. The initial value is
	   1. See glClearDepth().

       GL_DEPTH_FUNC

	   params returns one value, the symbolic constant that indicates the depth comparison
	   function. The initial value is GL_LESS. See glDepthFunc().

       GL_DEPTH_RANGE

	   params returns two values: the near and far mapping limits for the depth buffer.
	   Integer values, if requested, are linearly mapped from the internal floating-point
	   representation such that 1.0 returns the most positive representable integer value,
	   and -1.0 returns the most negative representable integer value. The initial value is
	   (0, 1). See glDepthRange().

       GL_DEPTH_TEST

	   params returns a single boolean value indicating whether depth testing of fragments is
	   enabled. The initial value is GL_FALSE. See glDepthFunc() and glDepthRange().

       GL_DEPTH_WRITEMASK

	   params returns a single boolean value indicating if the depth buffer is enabled for
	   writing. The initial value is GL_TRUE. See glDepthMask().

       GL_DITHER

	   params returns a single boolean value indicating whether dithering of fragment colors
	   and indices is enabled. The initial value is GL_TRUE.

       GL_DOUBLEBUFFER

	   params returns a single boolean value indicating whether double buffering is
	   supported.

       GL_DRAW_BUFFER

	   params returns one value, a symbolic constant indicating which buffers are being drawn
	   to. See glDrawBuffer(). The initial value is GL_BACK if there are back buffers,
	   otherwise it is GL_FRONT.

       GL_DRAW_BUFFERi

	   params returns one value, a symbolic constant indicating which buffers are being drawn
	   to by the corresponding output color. See glDrawBuffers(). The initial value of
	   GL_DRAW_BUFFER0 is GL_BACK if there are back buffers, otherwise it is GL_FRONT. The
	   initial values of draw buffers for all other output colors is GL_NONE.

       GL_DRAW_FRAMEBUFFER_BINDING

	   params returns one value, the name of the framebuffer object currently bound to the
	   GL_DRAW_FRAMEBUFFER target. If the default framebuffer is bound, this value will be
	   zero. The initial value is zero. See glBindFramebuffer().

       GL_READ_FRAMEBUFFER_BINDING

	   params returns one value, the name of the framebuffer object currently bound to the
	   GL_READ_FRAMEBUFFER target. If the default framebuffer is bound, this value will be
	   zero. The initial value is zero. See glBindFramebuffer().

       GL_ELEMENT_ARRAY_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   target GL_ELEMENT_ARRAY_BUFFER. If no buffer object is bound to this target, 0 is
	   returned. The initial value is 0. See glBindBuffer().

       GL_FRAGMENT_SHADER_DERIVATIVE_HINT

	   params returns one value, a symbolic constant indicating the mode of the derivative
	   accuracy hint for fragment shaders. The initial value is GL_DONT_CARE. See glHint().

       GL_IMPLEMENTATION_COLOR_READ_FORMAT

	   params returns a single GLenum value indicating the implementation's preferred pixel
	   data format. See glReadPixels().

       GL_IMPLEMENTATION_COLOR_READ_TYPE

	   params returns a single GLenum value indicating the implementation's preferred pixel
	   data type. See glReadPixels().

       GL_LINE_SMOOTH

	   params returns a single boolean value indicating whether antialiasing of lines is
	   enabled. The initial value is GL_FALSE. See glLineWidth().

       GL_LINE_SMOOTH_HINT

	   params returns one value, a symbolic constant indicating the mode of the line
	   antialiasing hint. The initial value is GL_DONT_CARE. See glHint().

       GL_LINE_WIDTH

	   params returns one value, the line width as specified with glLineWidth(). The initial
	   value is 1.

       GL_LAYER_PROVOKING_VERTEX

	   params returns one value, the implementation dependent specifc vertex of a primitive
	   that is used to select the rendering layer. If the value returned is equivalent to
	   GL_PROVOKING_VERTEX, then the vertex selection follows the convention specified by
	   glProvokingVertex(). If the value returned is equivalent to
	   GL_FIRST_VERTEX_CONVENTION, then the selection is always taken from the first vertex
	   in the primitive. If the value returned is equivalent to GL_LAST_VERTEX_CONVENTION,
	   then the selection is always taken from the last vertex in the primitive. If the value
	   returned is equivalent to GL_UNDEFINED_VERTEX, then the selection is not guaranteed to
	   be taken from any specific vertex in the primitive.

       GL_LINE_WIDTH_GRANULARITY

	   params returns one value, the width difference between adjacent supported widths for
	   antialiased lines. See glLineWidth().

       GL_LINE_WIDTH_RANGE

	   params returns two values: the smallest and largest supported widths for antialiased
	   lines. See glLineWidth().

       GL_LOGIC_OP_MODE

	   params returns one value, a symbolic constant indicating the selected logic operation
	   mode. The initial value is GL_COPY. See glLogicOp().

       GL_MAJOR_VERSION

	   params returns one value, the major version number of the OpenGL API supported by the
	   current context.

       GL_MAX_3D_TEXTURE_SIZE

	   params returns one value, a rough estimate of the largest 3D texture that the GL can
	   handle. The value must be at least 64. Use GL_PROXY_TEXTURE_3D to determine if a
	   texture is too large. See glTexImage3D().

       GL_MAX_ARRAY_TEXTURE_LAYERS

	   params returns one value. The value indicates the maximum number of layers allowed in
	   an array texture, and must be at least 256. See glTexImage2D().

       GL_MAX_CLIP_DISTANCES

	   params returns one value, the maximum number of application-defined clipping
	   distances. The value must be at least 8.

       GL_MAX_COLOR_TEXTURE_SAMPLES

	   params returns one value, the maximum number of samples in a color multisample
	   texture.

       GL_MAX_COMBINED_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to all
	   active shaders.

       GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS

	   params returns one value, the number of words for fragment shader uniform variables in
	   all uniform blocks (including default). The value must be at least 1. See glUniform().

       GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS

	   params returns one value, the number of words for geometry shader uniform variables in
	   all uniform blocks (including default). The value must be at least 1. See glUniform().

       GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS

	   params returns one value, the maximum supported texture image units that can be used
	   to access texture maps from the vertex shader and the fragment processor combined. If
	   both the vertex shader and the fragment processing stage access the same texture image
	   unit, then that counts as using two texture image units against this limit. The value
	   must be at least 48. See glActiveTexture().

       GL_MAX_COMBINED_UNIFORM_BLOCKS

	   params returns one value, the maximum number of uniform blocks per program. The value
	   must be at least 36. See glUniformBlockBinding().

       GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS

	   params returns one value, the number of words for vertex shader uniform variables in
	   all uniform blocks (including default). The value must be at least 1. See glUniform().

       GL_MAX_CUBE_MAP_TEXTURE_SIZE

	   params returns one value. The value gives a rough estimate of the largest cube-map
	   texture that the GL can handle. The value must be at least 1024. Use
	   GL_PROXY_TEXTURE_CUBE_MAP to determine if a texture is too large. See glTexImage2D().

       GL_MAX_DEPTH_TEXTURE_SAMPLES

	   params returns one value, the maximum number of samples in a multisample depth or
	   depth-stencil texture.

       GL_MAX_DRAW_BUFFERS

	   params returns one value, the maximum number of simultaneous outputs that may be
	   written in a fragment shader. The value must be at least 8. See glDrawBuffers().

       GL_MAX_DUALSOURCE_DRAW_BUFFERS

	   params returns one value, the maximum number of active draw buffers when using
	   dual-source blending. The value must be at least 1. See glBlendFunc() and
	   glBlendFuncSeparate().

       GL_MAX_ELEMENTS_INDICES

	   params returns one value, the recommended maximum number of vertex array indices. See
	   glDrawRangeElements().

       GL_MAX_ELEMENTS_VERTICES

	   params returns one value, the recommended maximum number of vertex array vertices. See
	   glDrawRangeElements().

       GL_MAX_FRAGMENT_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to
	   fragment shaders.

       GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum number of active shader storage blocks that may
	   be accessed by a fragment shader.

       GL_MAX_FRAGMENT_INPUT_COMPONENTS

	   params returns one value, the maximum number of components of the inputs read by the
	   fragment shader, which must be at least 128.

       GL_MAX_FRAGMENT_UNIFORM_COMPONENTS

	   params returns one value, the maximum number of individual floating-point, integer, or
	   boolean values that can be held in uniform variable storage for a fragment shader. The
	   value must be at least 1024. See glUniform().

       GL_MAX_FRAGMENT_UNIFORM_VECTORS

	   params returns one value, the maximum number of individual 4-vectors of
	   floating-point, integer, or boolean values that can be held in uniform variable
	   storage for a fragment shader. The value is equal to the value of
	   GL_MAX_FRAGMENT_UNIFORM_COMPONENTS divided by 4 and must be at least 256. See
	   glUniform().

       GL_MAX_FRAGMENT_UNIFORM_BLOCKS

	   params returns one value, the maximum number of uniform blocks per fragment shader.
	   The value must be at least 12. See glUniformBlockBinding().

       GL_MAX_FRAMEBUFFER_WIDTH

	   params returns one value, the maximum width for a framebuffer that has no attachments,
	   which must be at least 16384. See glFramebufferParameter().

       GL_MAX_FRAMEBUFFER_HEIGHT

	   params returns one value, the maximum height for a framebuffer that has no
	   attachments, which must be at least 16384. See glFramebufferParameter().

       GL_MAX_FRAMEBUFFER_LAYERS

	   params returns one value, the maximum number of layers for a framebuffer that has no
	   attachments, which must be at least 2048. See glFramebufferParameter().

       GL_MAX_FRAMEBUFFER_SAMPLES

	   params returns one value, the maximum samples in a framebuffer that has no
	   attachments, which must be at least 4. See glFramebufferParameter().

       GL_MAX_GEOMETRY_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to
	   geometry shaders.

       GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum number of active shader storage blocks that may
	   be accessed by a geometry shader.

       GL_MAX_GEOMETRY_INPUT_COMPONENTS

	   params returns one value, the maximum number of components of inputs read by a
	   geometry shader, which must be at least 64.

       GL_MAX_GEOMETRY_OUTPUT_COMPONENTS

	   params returns one value, the maximum number of components of outputs written by a
	   geometry shader, which must be at least 128.

       GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS

	   params returns one value, the maximum supported texture image units that can be used
	   to access texture maps from the geometry shader. The value must be at least 16. See
	   glActiveTexture().

       GL_MAX_GEOMETRY_UNIFORM_BLOCKS

	   params returns one value, the maximum number of uniform blocks per geometry shader.
	   The value must be at least 12. See glUniformBlockBinding().

       GL_MAX_GEOMETRY_UNIFORM_COMPONENTS

	   params returns one value, the maximum number of individual floating-point, integer, or
	   boolean values that can be held in uniform variable storage for a geometry shader. The
	   value must be at least 1024. See glUniform().

       GL_MAX_INTEGER_SAMPLES

	   params returns one value, the maximum number of samples supported in integer format
	   multisample buffers.

       GL_MIN_MAP_BUFFER_ALIGNMENT

	   params returns one value, the minimum alignment in basic machine units of pointers
	   returned fromglMapBuffer() and glMapBufferRange(). This value must be a power of two
	   and must be at least 64.

       GL_MAX_LABEL_LENGTH

	   params returns one value, the maximum length of a label that may be assigned to an
	   object. See glObjectLabel() and glObjectPtrLabel().

       GL_MAX_PROGRAM_TEXEL_OFFSET

	   params returns one value, the maximum texel offset allowed in a texture lookup, which
	   must be at least 7.

       GL_MIN_PROGRAM_TEXEL_OFFSET

	   params returns one value, the minimum texel offset allowed in a texture lookup, which
	   must be at most -8.

       GL_MAX_RECTANGLE_TEXTURE_SIZE

	   params returns one value. The value gives a rough estimate of the largest rectangular
	   texture that the GL can handle. The value must be at least 1024. Use
	   GL_PROXY_RECTANGLE_TEXTURE to determine if a texture is too large. See glTexImage2D().

       GL_MAX_RENDERBUFFER_SIZE

	   params returns one value. The value indicates the maximum supported size for
	   renderbuffers. See glFramebufferRenderbuffer().

       GL_MAX_SAMPLE_MASK_WORDS

	   params returns one value, the maximum number of sample mask words.

       GL_MAX_SERVER_WAIT_TIMEOUT

	   params returns one value, the maximum glWaitSync() timeout interval.

       GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS

	   params returns one value, the maximum number of shader storage buffer binding points
	   on the context, which must be at least 8.

       GL_MAX_TESS_CONTROL_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to
	   tessellation control shaders.

       GL_MAX_TESS_EVALUATION_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to
	   tessellation evaluation shaders.

       GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum number of active shader storage blocks that may
	   be accessed by a tessellation control shader.

       GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum number of active shader storage blocks that may
	   be accessed by a tessellation evaluation shader.

       GL_MAX_TEXTURE_BUFFER_SIZE

	   params returns one value. The value gives the maximum number of texels allowed in the
	   texel array of a texture buffer object. Value must be at least 65536.

       GL_MAX_TEXTURE_IMAGE_UNITS

	   params returns one value, the maximum supported texture image units that can be used
	   to access texture maps from the fragment shader. The value must be at least 16. See
	   glActiveTexture().

       GL_MAX_TEXTURE_LOD_BIAS

	   params returns one value, the maximum, absolute value of the texture level-of-detail
	   bias. The value must be at least 2.0.

       GL_MAX_TEXTURE_SIZE

	   params returns one value. The value gives a rough estimate of the largest texture that
	   the GL can handle. The value must be at least 1024. Use a proxy texture target such as
	   GL_PROXY_TEXTURE_1D or GL_PROXY_TEXTURE_2D to determine if a texture is too large. See
	   glTexImage1D() and glTexImage2D().

       GL_MAX_UNIFORM_BUFFER_BINDINGS

	   params returns one value, the maximum number of uniform buffer binding points on the
	   context, which must be at least 36.

       GL_MAX_UNIFORM_BLOCK_SIZE

	   params returns one value, the maximum size in basic machine units of a uniform block,
	   which must be at least 16384.

       GL_MAX_UNIFORM_LOCATIONS

	   params returns one value, the maximum number of explicitly assignable uniform
	   locations, which must be at least 1024.

       GL_MAX_VARYING_COMPONENTS

	   params returns one value, the number components for varying variables, which must be
	   at least 60.

       GL_MAX_VARYING_VECTORS

	   params returns one value, the number 4-vectors for varying variables, which is equal
	   to the value of GL_MAX_VARYING_COMPONENTS and must be at least 15.

       GL_MAX_VARYING_FLOATS

	   params returns one value, the maximum number of interpolators available for processing
	   varying variables used by vertex and fragment shaders. This value represents the
	   number of individual floating-point values that can be interpolated; varying variables
	   declared as vectors, matrices, and arrays will all consume multiple interpolators. The
	   value must be at least 32.

       GL_MAX_VERTEX_ATOMIC_COUNTERS

	   params returns a single value, the maximum number of atomic counters available to
	   vertex shaders.

       GL_MAX_VERTEX_ATTRIBS

	   params returns one value, the maximum number of 4-component generic vertex attributes
	   accessible to a vertex shader. The value must be at least 16. See glVertexAttrib().

       GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS

	   params returns one value, the maximum number of active shader storage blocks that may
	   be accessed by a vertex shader.

       GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS

	   params returns one value, the maximum supported texture image units that can be used
	   to access texture maps from the vertex shader. The value may be at least 16. See
	   glActiveTexture().

       GL_MAX_VERTEX_UNIFORM_COMPONENTS

	   params returns one value, the maximum number of individual floating-point, integer, or
	   boolean values that can be held in uniform variable storage for a vertex shader. The
	   value must be at least 1024. See glUniform().

       GL_MAX_VERTEX_UNIFORM_VECTORS

	   params returns one value, the maximum number of 4-vectors that may be held in uniform
	   variable storage for the vertex shader. The value of GL_MAX_VERTEX_UNIFORM_VECTORS is
	   equal to the value of GL_MAX_VERTEX_UNIFORM_COMPONENTS and must be at least 256.

       GL_MAX_VERTEX_OUTPUT_COMPONENTS

	   params returns one value, the maximum number of components of output written by a
	   vertex shader, which must be at least 64.

       GL_MAX_VERTEX_UNIFORM_BLOCKS

	   params returns one value, the maximum number of uniform blocks per vertex shader. The
	   value must be at least 12. See glUniformBlockBinding().

       GL_MAX_VIEWPORT_DIMS

	   params returns two values: the maximum supported width and height of the viewport.
	   These must be at least as large as the visible dimensions of the display being
	   rendered to. See glViewport().

       GL_MAX_VIEWPORTS

	   params returns one value, the maximum number of simultaneous viewports that are
	   supported. The value must be at least 16. See glViewportIndexed().

       GL_MINOR_VERSION

	   params returns one value, the minor version number of the OpenGL API supported by the
	   current context.

       GL_NUM_COMPRESSED_TEXTURE_FORMATS

	   params returns a single integer value indicating the number of available compressed
	   texture formats. The minimum value is 4. See glCompressedTexImage2D().

       GL_NUM_EXTENSIONS

	   params returns one value, the number of extensions supported by the GL implementation
	   for the current context. See glGetString().

       GL_NUM_PROGRAM_BINARY_FORMATS

	   params returns one value, the number of program binary formats supported by the
	   implementation.

       GL_NUM_SHADER_BINARY_FORMATS

	   params returns one value, the number of binary shader formats supported by the
	   implementation. If this value is greater than zero, then the implementation supports
	   loading binary shaders. If it is zero, then the loading of binary shaders by the
	   implementation is not supported.

       GL_PACK_ALIGNMENT

	   params returns one value, the byte alignment used for writing pixel data to memory.
	   The initial value is 4. See glPixelStore().

       GL_PACK_IMAGE_HEIGHT

	   params returns one value, the image height used for writing pixel data to memory. The
	   initial value is 0. See glPixelStore().

       GL_PACK_LSB_FIRST

	   params returns a single boolean value indicating whether single-bit pixels being
	   written to memory are written first to the least significant bit of each unsigned
	   byte. The initial value is GL_FALSE. See glPixelStore().

       GL_PACK_ROW_LENGTH

	   params returns one value, the row length used for writing pixel data to memory. The
	   initial value is 0. See glPixelStore().

       GL_PACK_SKIP_IMAGES

	   params returns one value, the number of pixel images skipped before the first pixel is
	   written into memory. The initial value is 0. See glPixelStore().

       GL_PACK_SKIP_PIXELS

	   params returns one value, the number of pixel locations skipped before the first pixel
	   is written into memory. The initial value is 0. See glPixelStore().

       GL_PACK_SKIP_ROWS

	   params returns one value, the number of rows of pixel locations skipped before the
	   first pixel is written into memory. The initial value is 0. See glPixelStore().

       GL_PACK_SWAP_BYTES

	   params returns a single boolean value indicating whether the bytes of two-byte and
	   four-byte pixel indices and components are swapped before being written to memory. The
	   initial value is GL_FALSE. See glPixelStore().

       GL_PIXEL_PACK_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   target GL_PIXEL_PACK_BUFFER. If no buffer object is bound to this target, 0 is
	   returned. The initial value is 0. See glBindBuffer().

       GL_PIXEL_UNPACK_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   target GL_PIXEL_UNPACK_BUFFER. If no buffer object is bound to this target, 0 is
	   returned. The initial value is 0. See glBindBuffer().

       GL_POINT_FADE_THRESHOLD_SIZE

	   params returns one value, the point size threshold for determining the point size. See
	   glPointParameter().

       GL_PRIMITIVE_RESTART_INDEX

	   params returns one value, the current primitive restart index. The initial value is 0.
	   See glPrimitiveRestartIndex().

       GL_PROGRAM_BINARY_FORMATS

	   params an array of GL_NUM_PROGRAM_BINARY_FORMATS values, indicating the proram binary
	   formats supported by the implementation.

       GL_PROGRAM_PIPELINE_BINDING

	   params a single value, the name of the currently bound program pipeline object, or
	   zero if no program pipeline object is bound. See glBindProgramPipeline().

       GL_PROVOKING_VERTEX

	   params returns one value, the currently selected provoking vertex convention. The
	   initial value is GL_LAST_VERTEX_CONVENTION. See glProvokingVertex().

       GL_POINT_SIZE

	   params returns one value, the point size as specified by glPointSize(). The initial
	   value is 1.

       GL_POINT_SIZE_GRANULARITY

	   params returns one value, the size difference between adjacent supported sizes for
	   antialiased points. See glPointSize().

       GL_POINT_SIZE_RANGE

	   params returns two values: the smallest and largest supported sizes for antialiased
	   points. The smallest size must be at most 1, and the largest size must be at least 1.
	   See glPointSize().

       GL_POLYGON_OFFSET_FACTOR

	   params returns one value, the scaling factor used to determine the variable offset
	   that is added to the depth value of each fragment generated when a polygon is
	   rasterized. The initial value is 0. See glPolygonOffset().

       GL_POLYGON_OFFSET_UNITS

	   params returns one value. This value is multiplied by an implementation-specific value
	   and then added to the depth value of each fragment generated when a polygon is
	   rasterized. The initial value is 0. See glPolygonOffset().

       GL_POLYGON_OFFSET_FILL

	   params returns a single boolean value indicating whether polygon offset is enabled for
	   polygons in fill mode. The initial value is GL_FALSE. See glPolygonOffset().

       GL_POLYGON_OFFSET_LINE

	   params returns a single boolean value indicating whether polygon offset is enabled for
	   polygons in line mode. The initial value is GL_FALSE. See glPolygonOffset().

       GL_POLYGON_OFFSET_POINT

	   params returns a single boolean value indicating whether polygon offset is enabled for
	   polygons in point mode. The initial value is GL_FALSE. See glPolygonOffset().

       GL_POLYGON_SMOOTH

	   params returns a single boolean value indicating whether antialiasing of polygons is
	   enabled. The initial value is GL_FALSE. See glPolygonMode().

       GL_POLYGON_SMOOTH_HINT

	   params returns one value, a symbolic constant indicating the mode of the polygon
	   antialiasing hint. The initial value is GL_DONT_CARE. See glHint().

       GL_READ_BUFFER

	   params returns one value, a symbolic constant indicating which color buffer is
	   selected for reading. The initial value is GL_BACK if there is a back buffer,
	   otherwise it is GL_FRONT. See glReadPixels().

       GL_RENDERBUFFER_BINDING

	   params returns a single value, the name of the renderbuffer object currently bound to
	   the target GL_RENDERBUFFER. If no renderbuffer object is bound to this target, 0 is
	   returned. The initial value is 0. See glBindRenderbuffer().

       GL_SAMPLE_BUFFERS

	   params returns a single integer value indicating the number of sample buffers
	   associated with the framebuffer. See glSampleCoverage().

       GL_SAMPLE_COVERAGE_VALUE

	   params returns a single positive floating-point value indicating the current sample
	   coverage value. See glSampleCoverage().

       GL_SAMPLE_COVERAGE_INVERT

	   params returns a single boolean value indicating if the temporary coverage value
	   should be inverted. See glSampleCoverage().

       GL_SAMPLER_BINDING

	   params returns a single value, the name of the sampler object currently bound to the
	   active texture unit. The initial value is 0. See glBindSampler().

       GL_SAMPLES

	   params returns a single integer value indicating the coverage mask size. See
	   glSampleCoverage().

       GL_SCISSOR_BOX

	   params returns four values: the x and y window coordinates of the scissor box,
	   followed by its width and height. Initially the x and y window coordinates are both 0
	   and the width and height are set to the size of the window. See glScissor().

       GL_SCISSOR_TEST

	   params returns a single boolean value indicating whether scissoring is enabled. The
	   initial value is GL_FALSE. See glScissor().

       GL_SHADER_COMPILER

	   params returns a single boolean value indicating whether an online shader compiler is
	   present in the implementation. All desktop OpenGL implementations must support online
	   shader compilations, and therefore the value of GL_SHADER_COMPILER will always be
	   GL_TRUE.

       GL_SHADER_STORAGE_BUFFER_BINDING

	   When used with non-indexed variants of glGet (such as glGetIntegerv), params returns a
	   single value, the name of the buffer object currently bound to the target
	   GL_SHADER_STORAGE_BUFFER. If no buffer object is bound to this target, 0 is returned.
	   When used with indexed variants of glGet (such as glGetIntegeri_v), params returns a
	   single value, the name of the buffer object bound to the indexed shader storage buffer
	   binding points. The initial value is 0 for all targets. See glBindBuffer(),
	   glBindBufferBase(), and glBindBufferRange().

       GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT

	   params returns a single value, the minimum required alignment for shader storage
	   buffer sizes and offset. The initial value is 1. See glShaderStorateBlockBinding().

       GL_SHADER_STORAGE_BUFFER_START

	   When used with indexed variants of glGet (such as glGetInteger64i_v), params returns a
	   single value, the start offset of the binding range for each indexed shader storage
	   buffer binding. The initial value is 0 for all bindings. See glBindBufferRange().

       GL_SHADER_STORAGE_BUFFER_SIZE

	   When used with indexed variants of glGet (such as glGetInteger64i_v), params returns a
	   single value, the size of the binding range for each indexed shader storage buffer
	   binding. The initial value is 0 for all bindings. See glBindBufferRange().

       GL_SMOOTH_LINE_WIDTH_RANGE

	   params returns a pair of values indicating the range of widths supported for smooth
	   (antialiased) lines. See glLineWidth().

       GL_SMOOTH_LINE_WIDTH_GRANULARITY

	   params returns a single value indicating the level of quantization applied to smooth
	   line width parameters.

       GL_STENCIL_BACK_FAIL

	   params returns one value, a symbolic constant indicating what action is taken for
	   back-facing polygons when the stencil test fails. The initial value is GL_KEEP. See
	   glStencilOpSeparate().

       GL_STENCIL_BACK_FUNC

	   params returns one value, a symbolic constant indicating what function is used for
	   back-facing polygons to compare the stencil reference value with the stencil buffer
	   value. The initial value is GL_ALWAYS. See glStencilFuncSeparate().

       GL_STENCIL_BACK_PASS_DEPTH_FAIL

	   params returns one value, a symbolic constant indicating what action is taken for
	   back-facing polygons when the stencil test passes, but the depth test fails. The
	   initial value is GL_KEEP. See glStencilOpSeparate().

       GL_STENCIL_BACK_PASS_DEPTH_PASS

	   params returns one value, a symbolic constant indicating what action is taken for
	   back-facing polygons when the stencil test passes and the depth test passes. The
	   initial value is GL_KEEP. See glStencilOpSeparate().

       GL_STENCIL_BACK_REF

	   params returns one value, the reference value that is compared with the contents of
	   the stencil buffer for back-facing polygons. The initial value is 0. See
	   glStencilFuncSeparate().

       GL_STENCIL_BACK_VALUE_MASK

	   params returns one value, the mask that is used for back-facing polygons to mask both
	   the stencil reference value and the stencil buffer value before they are compared. The
	   initial value is all 1's. See glStencilFuncSeparate().

       GL_STENCIL_BACK_WRITEMASK

	   params returns one value, the mask that controls writing of the stencil bitplanes for
	   back-facing polygons. The initial value is all 1's. See glStencilMaskSeparate().

       GL_STENCIL_CLEAR_VALUE

	   params returns one value, the index to which the stencil bitplanes are cleared. The
	   initial value is 0. See glClearStencil().

       GL_STENCIL_FAIL

	   params returns one value, a symbolic constant indicating what action is taken when the
	   stencil test fails. The initial value is GL_KEEP. See glStencilOp(). This stencil
	   state only affects non-polygons and front-facing polygons. Back-facing polygons use
	   separate stencil state. See glStencilOpSeparate().

       GL_STENCIL_FUNC

	   params returns one value, a symbolic constant indicating what function is used to
	   compare the stencil reference value with the stencil buffer value. The initial value
	   is GL_ALWAYS. See glStencilFunc(). This stencil state only affects non-polygons and
	   front-facing polygons. Back-facing polygons use separate stencil state. See
	   glStencilFuncSeparate().

       GL_STENCIL_PASS_DEPTH_FAIL

	   params returns one value, a symbolic constant indicating what action is taken when the
	   stencil test passes, but the depth test fails. The initial value is GL_KEEP. See
	   glStencilOp(). This stencil state only affects non-polygons and front-facing polygons.
	   Back-facing polygons use separate stencil state. See glStencilOpSeparate().

       GL_STENCIL_PASS_DEPTH_PASS

	   params returns one value, a symbolic constant indicating what action is taken when the
	   stencil test passes and the depth test passes. The initial value is GL_KEEP. See
	   glStencilOp(). This stencil state only affects non-polygons and front-facing polygons.
	   Back-facing polygons use separate stencil state. See glStencilOpSeparate().

       GL_STENCIL_REF

	   params returns one value, the reference value that is compared with the contents of
	   the stencil buffer. The initial value is 0. See glStencilFunc(). This stencil state
	   only affects non-polygons and front-facing polygons. Back-facing polygons use separate
	   stencil state. See glStencilFuncSeparate().

       GL_STENCIL_TEST

	   params returns a single boolean value indicating whether stencil testing of fragments
	   is enabled. The initial value is GL_FALSE. See glStencilFunc() and glStencilOp().

       GL_STENCIL_VALUE_MASK

	   params returns one value, the mask that is used to mask both the stencil reference
	   value and the stencil buffer value before they are compared. The initial value is all
	   1's. See glStencilFunc(). This stencil state only affects non-polygons and
	   front-facing polygons. Back-facing polygons use separate stencil state. See
	   glStencilFuncSeparate().

       GL_STENCIL_WRITEMASK

	   params returns one value, the mask that controls writing of the stencil bitplanes. The
	   initial value is all 1's. See glStencilMask(). This stencil state only affects
	   non-polygons and front-facing polygons. Back-facing polygons use separate stencil
	   state. See glStencilMaskSeparate().

       GL_STEREO

	   params returns a single boolean value indicating whether stereo buffers (left and
	   right) are supported.

       GL_SUBPIXEL_BITS

	   params returns one value, an estimate of the number of bits of subpixel resolution
	   that are used to position rasterized geometry in window coordinates. The value must be
	   at least 4.

       GL_TEXTURE_BINDING_1D

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_1D. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_1D_ARRAY

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_1D_ARRAY. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_2D

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_2D. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_2D_ARRAY

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_2D_ARRAY. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_2D_MULTISAMPLE

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_2D_MULTISAMPLE. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_2D_MULTISAMPLE_ARRAY. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_3D

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_3D. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_BUFFER

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_BUFFER. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_CUBE_MAP

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_CUBE_MAP. The initial value is 0. See glBindTexture().

       GL_TEXTURE_BINDING_RECTANGLE

	   params returns a single value, the name of the texture currently bound to the target
	   GL_TEXTURE_RECTANGLE. The initial value is 0. See glBindTexture().

       GL_TEXTURE_COMPRESSION_HINT

	   params returns a single value indicating the mode of the texture compression hint. The
	   initial value is GL_DONT_CARE.

       GL_TEXTURE_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   GL_TEXTURE_BUFFER buffer binding point. The initial value is 0. See glBindBuffer().

       GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT

	   params returns a single value, the minimum required alignment for texture buffer sizes
	   and offset. The initial value is 1. See glUniformBlockBinding().

       GL_TIMESTAMP

	   params returns a single value, the 64-bit value of the current GL time. See
	   glQueryCounter().

       GL_TRANSFORM_FEEDBACK_BUFFER_BINDING

	   When used with non-indexed variants of glGet (such as glGetIntegerv), params returns a
	   single value, the name of the buffer object currently bound to the target
	   GL_TRANSFORM_FEEDBACK_BUFFER. If no buffer object is bound to this target, 0 is
	   returned. When used with indexed variants of glGet (such as glGetIntegeri_v), params
	   returns a single value, the name of the buffer object bound to the indexed transform
	   feedback attribute stream. The initial value is 0 for all targets. See glBindBuffer(),
	   glBindBufferBase(), and glBindBufferRange().

       GL_TRANSFORM_FEEDBACK_BUFFER_START

	   When used with indexed variants of glGet (such as glGetInteger64i_v), params returns a
	   single value, the start offset of the binding range for each transform feedback
	   attribute stream. The initial value is 0 for all streams. See glBindBufferRange().

       GL_TRANSFORM_FEEDBACK_BUFFER_SIZE

	   When used with indexed variants of glGet (such as glGetInteger64i_v), params returns a
	   single value, the size of the binding range for each transform feedback attribute
	   stream. The initial value is 0 for all streams. See glBindBufferRange().

       GL_UNIFORM_BUFFER_BINDING

	   When used with non-indexed variants of glGet (such as glGetIntegerv), params returns a
	   single value, the name of the buffer object currently bound to the target
	   GL_UNIFORM_BUFFER. If no buffer object is bound to this target, 0 is returned. When
	   used with indexed variants of glGet (such as glGetIntegeri_v), params returns a single
	   value, the name of the buffer object bound to the indexed uniform buffer binding
	   point. The initial value is 0 for all targets. See glBindBuffer(), glBindBufferBase(),
	   and glBindBufferRange().

       GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT

	   params returns a single value, the minimum required alignment for uniform buffer sizes
	   and offset. The initial value is 1. See glUniformBlockBinding().

       GL_UNIFORM_BUFFER_SIZE

	   When used with indexed variants of glGet (such as glGetInteger64i_v), params returns a
	   single value, the size of the binding range for each indexed uniform buffer binding.
	   The initial value is 0 for all bindings. See glBindBufferRange().

       GL_UNIFORM_BUFFER_START

	   When used with indexed variants of glGet (such as glGetInteger64i_v), params returns a
	   single value, the start offset of the binding range for each indexed uniform buffer
	   binding. The initial value is 0 for all bindings. See glBindBufferRange().

       GL_UNPACK_ALIGNMENT

	   params returns one value, the byte alignment used for reading pixel data from memory.
	   The initial value is 4. See glPixelStore().

       GL_UNPACK_IMAGE_HEIGHT

	   params returns one value, the image height used for reading pixel data from memory.
	   The initial is 0. See glPixelStore().

       GL_UNPACK_LSB_FIRST

	   params returns a single boolean value indicating whether single-bit pixels being read
	   from memory are read first from the least significant bit of each unsigned byte. The
	   initial value is GL_FALSE. See glPixelStore().

       GL_UNPACK_ROW_LENGTH

	   params returns one value, the row length used for reading pixel data from memory. The
	   initial value is 0. See glPixelStore().

       GL_UNPACK_SKIP_IMAGES

	   params returns one value, the number of pixel images skipped before the first pixel is
	   read from memory. The initial value is 0. See glPixelStore().

       GL_UNPACK_SKIP_PIXELS

	   params returns one value, the number of pixel locations skipped before the first pixel
	   is read from memory. The initial value is 0. See glPixelStore().

       GL_UNPACK_SKIP_ROWS

	   params returns one value, the number of rows of pixel locations skipped before the
	   first pixel is read from memory. The initial value is 0. See glPixelStore().

       GL_UNPACK_SWAP_BYTES

	   params returns a single boolean value indicating whether the bytes of two-byte and
	   four-byte pixel indices and components are swapped after being read from memory. The
	   initial value is GL_FALSE. See glPixelStore().

       GL_VERTEX_PROGRAM_POINT_SIZE

	   params returns a single boolean value indicating whether vertex program point size
	   mode is enabled. If enabled, and a vertex shader is active, then the point size is
	   taken from the shader built-in gl_PointSize. If disabled, and a vertex shader is
	   active, then the point size is taken from the point state as specified by
	   glPointSize(). The initial value is GL_FALSE.

       GL_VERTEX_BINDING_DIVISOR

	   Accepted by the indexed forms.  params returns a single integer value representing the
	   instance step divisor of the first element in the bound buffer's data store for vertex
	   attribute bound to index.

       GL_VERTEX_BINDING_OFFSET

	   Accepted by the indexed forms.  params returns a single integer value representing the
	   byte offset of the first element in the bound buffer's data store for vertex attribute
	   bound to index.

       GL_VERTEX_BINDING_STRIDE

	   Accepted by the indexed forms.  params returns a single integer value representing the
	   byte offset between the start of each element in the bound buffer's data store for
	   vertex attribute bound to index.

       GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET

	   params returns a single integer value containing the maximum offset that may be added
	   to a vertex binding offset.

       GL_MAX_VERTEX_ATTRIB_BINDINGS

	   params returns a single integer value containing the maximum number of vertex buffers
	   that may be bound.

       GL_VIEWPORT

	   When used with non-indexed variants of glGet (such as glGetIntegerv), params returns
	   four values: the x and y window coordinates of the viewport, followed by its width and
	   height. Initially the x and y window coordinates are both set to 0, and the width and
	   height are set to the width and height of the window into which the GL will do its
	   rendering. See glViewport(). When used with indexed variants of glGet (such as
	   glGetIntegeri_v), params returns four values: the x and y window coordinates of the
	   indexed viewport, followed by its width and height. Initially the x and y window
	   coordinates are both set to 0, and the width and height are set to the width and
	   height of the window into which the GL will do its rendering. See
	   glViewportIndexedf().

       GL_VIEWPORT_BOUNDS_RANGE

	   params returns two values, the minimum and maximum viewport bounds range. The minimum
	   range should be at least [-32768, 32767].

       GL_VIEWPORT_INDEX_PROVOKING_VERTEX

	   params returns one value, the implementation dependent specifc vertex of a primitive
	   that is used to select the viewport index. If the value returned is equivalent to
	   GL_PROVOKING_VERTEX, then the vertex selection follows the convention specified by
	   glProvokingVertex(). If the value returned is equivalent to
	   GL_FIRST_VERTEX_CONVENTION, then the selection is always taken from the first vertex
	   in the primitive. If the value returned is equivalent to GL_LAST_VERTEX_CONVENTION,
	   then the selection is always taken from the last vertex in the primitive. If the value
	   returned is equivalent to GL_UNDEFINED_VERTEX, then the selection is not guaranteed to
	   be taken from any specific vertex in the primitive.

       GL_VIEWPORT_SUBPIXEL_BITS

	   params returns a single value, the number of bits of sub-pixel precision which the GL
	   uses to interpret the floating point viewport bounds. The minimum value is 0.

       GL_MAX_ELEMENT_INDEX

	   params returns a single value, the maximum index that may be specified during the
	   transfer of generic vertex attributes to the GL.

       Many of the boolean parameters can also be queried more easily using glIsEnabled().

NOTES
       The following parameters return the associated value for the active texture unit:
       GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D, GL_TEXTURE_3D
       and GL_TEXTURE_BINDING_3D.

       GL_MAX_VIEWPORTS, GL_VIEWPORT_SUBPIXEL_BITS, GL_VIEWPORT_BOUNDS_RANGE,
       GL_LAYER_PROVOKING_VERTEX, and GL_VIEWPORT_INDEX_PROVOKING_VERTEX are available only if
       the GL version is 4.1 or greater.

       GL_MAX_VERTEX_ATOMIC_COUNTERS, GL_MAX_TESS_CONTROL_ATOMIC_COUNTERS,
       GL_MAX_TESS_EVALUATION_ATOMIC_COUNTERS, GL_MAX_GEOMETRY_ATOMIC_COUNTERS,
       GL_MAX_FRAMGENT_ATOMIC_COUNTERS, and GL_MIN_MAP_BUFFER_ALIGNMENT are accepted by pname
       only if the GL version is 4.2 or greater.

       GL_MAX_ELEMENT_INDEX is accepted by pname only if the GL version is 4.3 or greater.

       GL_MAX_COMPUTE_UNIFORM_BLOCKS, GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS,
       GL_MAX_COMPUTE_UNIFORM_COMPONENTS, GL_MAX_COMPUTE_ATOMIC_COUNTERS,
       GL_MAX_COMPUTE_ATOMIC_COUNTER_BUFFERS, GL_MAX_COMBINED_COMPUTE_UNIFORM_COMPONENTS,
       GL_MAX_COMPUTE_WORK_GROUP_INVOCATIONS, GL_MAX_COMPUTE_WORK_GROUP_COUNT, and
       GL_MAX_COMPUTE_WORK_GROUP_SIZE and GL_DISPATCH_INDIRECT_BUFFER_BINDING are available only
       if the GL version is 4.3 or greater.

       GL_MAX_DEBUG_GROUP_STACK_DEPTH, GL_DEBUG_GROUP_STACK_DEPTH and GL_MAX_LABEL_LENGTH are
       accepted only if the GL version is 4.3 or greater.

       GL_MAX_UNIFORM_LOCATIONS is accepted only if the GL version is 4.3 or greater.

       GL_MAX_FRAMEBUFFER_WIDTH, GL_MAX_FRAMEBUFFER_HEIGHT, GL_MAX_FRAMEBUFFER_LAYERS, and
       GL_MAX_FRAMEBUFFER_SAMPLES are available only if the GL version is 4.3 or greater.

       GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS,
       GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS, GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS,
       GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS, and GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS are
       available only if the GL version is 4.3 or higher.

       GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT is available only if the GL version is 4.3 or greater.

       GL_VERTEX_BINDING_DIVISOR, GL_VERTEX_BINDING_OFFSET, GL_VERTEX_BINDING_STRIDE,
       GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET and GL_MAX_VERTEX_ATTRIB_BINDINGS are available only
       if the GL version is 4.3 or greater.

ERRORS
       GL_INVALID_ENUM is generated if pname is not an accepted value.

       GL_INVALID_VALUE is generated on any of glGetBooleani_v, glGetIntegeri_v, or
       glGetInteger64i_v if index is outside of the valid range for the indexed state target.

SEE ALSO
       glGetActiveUniform(), glGetAttachedShaders(), glGetAttribLocation(),
       glGetBufferParameter(), glGetBufferPointerv(), glGetBufferSubData(),
       glGetCompressedTexImage(), glGetError(), glGetProgram(), glGetProgramInfoLog(),
       glGetQueryiv(), glGetQueryObject(), glGetShader(), glGetShaderInfoLog(),
       glGetShaderSource(), glGetString(), glGetTexImage(), glGetTexLevelParameter(),
       glGetTexParameter(), glGetUniform(), glGetUniformLocation(), glGetVertexAttrib(),
       glGetVertexAttribPointerv(), glIsEnabled()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. Copyright (C) 2010-2011 Khronos Group. This
       document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014					GLGET(3G)
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